Mapping Composition Evolution through Synthesis, Purification, and Depolymerization of Random Heteropolymers

Yu, Hao; Liu, Luofu; Yin, Ruilin; Jayapurna, Ivan; Wang, Rui; Xu, Ting

doi:10.1021/jacs.3c13909

Title: Mapping Composition Evolution through Synthesis, Purification, and Depolymerization of Random Heteropolymers

Journal Article · 22 February 2024 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.3c13909 · OSTI ID:2469689

^[1]; Liu, Luofu ^[1];

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^[1]

Univ. of California, Berkeley, CA (United States)

Random heteropolymers (RHPs) consisting of three or more comonomers have been routinely used to synthesize functional materials. While increasing the monomer variety diversifies the side-chain chemistry, this substantially expands the sequence space and leads to ensemble-level sequence heterogeneity. Most studies have relied on monomer composition and simulated sequences to design RHPs, but the questions remain unanswered regarding heterogeneities within each RHP ensemble and how closely these simulated sequences reflect the experimental outcomes. Here, we quantitatively mapped out the evolution of monomer compositions in four-monomer-based RHPs throughout a design-synthesis-purification-depolymerization process. By adopting a Jaacks method, we first determined 12 reactivity ratios directly from quaternary methacrylate RAFT copolymerization experiments to account for the influences of competitive monomer addition and the reversible activation/deactivation equilibria. The reliability of in silico analysis was affirmed by a quantitative agreement (<4% difference) between the simulated RHP compositions and the experimental results. Furthermore, we mapped out the conformation distribution within each ensemble in different solvents as a function of monomer chemistry, composition, and segmental characteristics via high-throughput computation based on self-consistent field theory (SCFT). These comprehensive studies confirmed monomer composition as a viable design parameter to engineer RHP-based functional materials as long as the reactivity ratios are accurately determined and the livingness of RHP synthesis is ensured.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Sponsoring Organization:: USDOE; National Science Foundation (NSF); US Army Research Office (ARO)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2469689

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 9 Vol. 146; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Copolymerization
Monomers
Physical and chemical properties
RAFT polymerization
Reactivity

Title: Mapping Composition Evolution through Synthesis, Purification, and Depolymerization of Random Heteropolymers

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